This paper investigates context awareness in business process modelling (BPM). It introduces a context model for BPM (CM4BPM) and a role-based business process model (RBPM), and presents an approach allowing enacting processes with respect to the context. Decisions driving business processes enactment are based on context related knowledge. The proposed approach consists on using contextual knowledge in order to enhance the adequacy of the assignments during the enactment of the business processes, it can be used to improve the design and implementation of business processes using existing process modeling languages in order to allow the support of context-aware process enactment.